wallet.h
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wallet.h
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	// Copyright (c) 2009-2010 Satoshi Nakamoto
	// Copyright (c) 2009-2012 The Bitcoin developers
	// Distributed under the MIT/X11 software license, see the accompanying
	// file COPYING or http://www.opensource.org/licenses/mit-license.php.
	#ifndef BITCOIN_WALLET_H
	#define BITCOIN_WALLET_H

	#include <string>
	#include <vector>

	#include <stdlib.h>

	#include "main.h"
	#include "key.h"
	#include "keystore.h"
	#include "script.h"
	#include "ui_interface.h"
	#include "util.h"

	class CAccountingEntry;
	class CWalletTx;
	class CReserveKey;
	class CWalletDB;
	class COutput;

	/** (client) version numbers for particular wallet features */
	enum WalletFeature
	{
	FEATURE_BASE = 10500, // the earliest version new wallets supports (only useful for getinfo's clientversion output)

	FEATURE_WALLETCRYPT = 40000, // wallet encryption
	FEATURE_COMPRPUBKEY = 60000, // compressed public keys

	FEATURE_LATEST = 60000
	};


	/** A key pool entry */
	class CKeyPool
	{
	public:
	int64 nTime;
	CPubKey vchPubKey;

	CKeyPool()
	{
	nTime = GetTime();
	}

	CKeyPool(const CPubKey& vchPubKeyIn)
	{
	nTime = GetTime();
	vchPubKey = vchPubKeyIn;
	}

	IMPLEMENT_SERIALIZE
	(
	if (!(nType & SER_GETHASH))
	READWRITE(nVersion);
	READWRITE(nTime);
	READWRITE(vchPubKey);
	)
	};

	/** A CWallet is an extension of a keystore, which also maintains a set of transactions and balances,
	* and provides the ability to create new transactions.
	*/
	class CWallet : public CCryptoKeyStore
	{
	private:
	bool SelectCoins(int64 nTargetValue, std::set<std::pair<const CWalletTx*,unsigned int> >& setCoinsRet, int64& nValueRet) const;

	CWalletDB *pwalletdbEncryption;

	// the current wallet version: clients below this version are not able to load the wallet
	int nWalletVersion;

	// the maximum wallet format version: memory-only variable that specifies to what version this wallet may be upgraded
	int nWalletMaxVersion;

	public:
	mutable CCriticalSection cs_wallet;

	bool fFileBacked;
	std::string strWalletFile;

	std::set<int64> setKeyPool;


	typedef std::map<unsigned int, CMasterKey> MasterKeyMap;
	MasterKeyMap mapMasterKeys;
	unsigned int nMasterKeyMaxID;

	CWallet()
	{
	nWalletVersion = FEATURE_BASE;
	nWalletMaxVersion = FEATURE_BASE;
	fFileBacked = false;
	nMasterKeyMaxID = 0;
	pwalletdbEncryption = NULL;
	nOrderPosNext = 0;
	}
	CWallet(std::string strWalletFileIn)
	{
	nWalletVersion = FEATURE_BASE;
	nWalletMaxVersion = FEATURE_BASE;
	strWalletFile = strWalletFileIn;
	fFileBacked = true;
	nMasterKeyMaxID = 0;
	pwalletdbEncryption = NULL;
	nOrderPosNext = 0;
	}

	std::map<uint256, CWalletTx> mapWallet;
	int64 nOrderPosNext;
	std::map<uint256, int> mapRequestCount;

	std::map<CTxDestination, std::string> mapAddressBook;

	CPubKey vchDefaultKey;

	// check whether we are allowed to upgrade (or already support) to the named feature
	bool CanSupportFeature(enum WalletFeature wf) { return nWalletMaxVersion >= wf; }

	void AvailableCoins(std::vector<COutput>& vCoins, bool fOnlyConfirmed=true) const;
	bool SelectCoinsMinConf(int64 nTargetValue, int nConfMine, int nConfTheirs, std::vector<COutput> vCoins, std::set<std::pair<const CWalletTx*,unsigned int> >& setCoinsRet, int64& nValueRet) const;

	// keystore implementation
	// Generate a new key
	CPubKey GenerateNewKey();
	// Adds a key to the store, and saves it to disk.
	bool AddKey(const CKey& key);
	// Adds a key to the store, without saving it to disk (used by LoadWallet)
	bool LoadKey(const CKey& key) { return CCryptoKeyStore::AddKey(key); }

	bool LoadMinVersion(int nVersion) { nWalletVersion = nVersion; nWalletMaxVersion = std::max(nWalletMaxVersion, nVersion); return true; }

	// Adds an encrypted key to the store, and saves it to disk.
	bool AddCryptedKey(const CPubKey &vchPubKey, const std::vector<unsigned char> &vchCryptedSecret);
	// Adds an encrypted key to the store, without saving it to disk (used by LoadWallet)
	bool LoadCryptedKey(const CPubKey &vchPubKey, const std::vector<unsigned char> &vchCryptedSecret) { SetMinVersion(FEATURE_WALLETCRYPT); return CCryptoKeyStore::AddCryptedKey(vchPubKey, vchCryptedSecret); }
	bool AddCScript(const CScript& redeemScript);
	bool LoadCScript(const CScript& redeemScript) { return CCryptoKeyStore::AddCScript(redeemScript); }

	bool Unlock(const SecureString& strWalletPassphrase);
	bool ChangeWalletPassphrase(const SecureString& strOldWalletPassphrase, const SecureString& strNewWalletPassphrase);
	bool EncryptWallet(const SecureString& strWalletPassphrase);

	/** Increment the next transaction order id
	@return next transaction order id
	*/
	int64 IncOrderPosNext();

	typedef std::pair<CWalletTx, CAccountingEntry> TxPair;
	typedef std::multimap<int64, TxPair > TxItems;

	/** Get the wallet's activity log
	@return multimap of ordered transactions and accounting entries
	@warning Returned pointers are only valid within the scope of passed acentries
	*/
	TxItems OrderedTxItems(std::list<CAccountingEntry>& acentries, std::string strAccount = "");

	void MarkDirty();
	bool AddToWallet(const CWalletTx& wtxIn);
	bool AddToWalletIfInvolvingMe(const CTransaction& tx, const CBlock* pblock, bool fUpdate = false, bool fFindBlock = false);
	bool EraseFromWallet(uint256 hash);
	void WalletUpdateSpent(const CTransaction& prevout);
	int ScanForWalletTransactions(CBlockIndex* pindexStart, bool fUpdate = false);
	int ScanForWalletTransaction(const uint256& hashTx);
	void ReacceptWalletTransactions();
	void ResendWalletTransactions();
	int64 GetBalance() const;
	int64 GetUnconfirmedBalance() const;
	int64 GetImmatureBalance() const;
	bool CreateTransaction(const std::vector<std::pair<CScript, int64> >& vecSend, CWalletTx& wtxNew, CReserveKey& reservekey, int64& nFeeRet);
	bool CreateTransaction(CScript scriptPubKey, int64 nValue, CWalletTx& wtxNew, CReserveKey& reservekey, int64& nFeeRet);
	bool CommitTransaction(CWalletTx& wtxNew, CReserveKey& reservekey);
	std::string SendMoney(CScript scriptPubKey, int64 nValue, CWalletTx& wtxNew, bool fAskFee=false);
	std::string SendMoneyToDestination(const CTxDestination &address, int64 nValue, CWalletTx& wtxNew, bool fAskFee=false);

	bool NewKeyPool();
	bool TopUpKeyPool();
	int64 AddReserveKey(const CKeyPool& keypool);
	void ReserveKeyFromKeyPool(int64& nIndex, CKeyPool& keypool);
	void KeepKey(int64 nIndex);
	void ReturnKey(int64 nIndex);
	bool GetKeyFromPool(CPubKey &key, bool fAllowReuse=true);
	int64 GetOldestKeyPoolTime();
	void GetAllReserveKeys(std::set<CKeyID>& setAddress);

	std::set< std::set<CTxDestination> > GetAddressGroupings();
	std::map<CTxDestination, int64> GetAddressBalances();

	bool IsMine(const CTxIn& txin) const;
	int64 GetDebit(const CTxIn& txin) const;
	bool IsMine(const CTxOut& txout) const
	{
	return ::IsMine(*this, txout.scriptPubKey);
	}
	int64 GetCredit(const CTxOut& txout) const
	{
	if (!MoneyRange(txout.nValue))
	throw std::runtime_error("CWallet::GetCredit() : value out of range");
	return (IsMine(txout) ? txout.nValue : 0);
	}
	bool IsChange(const CTxOut& txout) const;
	int64 GetChange(const CTxOut& txout) const
	{
	if (!MoneyRange(txout.nValue))
	throw std::runtime_error("CWallet::GetChange() : value out of range");
	return (IsChange(txout) ? txout.nValue : 0);
	}
	bool IsMine(const CTransaction& tx) const
	{
	BOOST_FOREACH(const CTxOut& txout, tx.vout)
	if (IsMine(txout))
	return true;
	return false;
	}
	bool IsFromMe(const CTransaction& tx) const
	{
	return (GetDebit(tx) > 0);
	}
	int64 GetDebit(const CTransaction& tx) const
	{
	int64 nDebit = 0;
	BOOST_FOREACH(const CTxIn& txin, tx.vin)
	{
	nDebit += GetDebit(txin);
	if (!MoneyRange(nDebit))
	throw std::runtime_error("CWallet::GetDebit() : value out of range");
	}
	return nDebit;
	}
	int64 GetCredit(const CTransaction& tx) const
	{
	int64 nCredit = 0;
	BOOST_FOREACH(const CTxOut& txout, tx.vout)
	{
	nCredit += GetCredit(txout);
	if (!MoneyRange(nCredit))
	throw std::runtime_error("CWallet::GetCredit() : value out of range");
	}
	return nCredit;
	}
	int64 GetChange(const CTransaction& tx) const
	{
	int64 nChange = 0;
	BOOST_FOREACH(const CTxOut& txout, tx.vout)
	{
	nChange += GetChange(txout);
	if (!MoneyRange(nChange))
	throw std::runtime_error("CWallet::GetChange() : value out of range");
	}
	return nChange;
	}
	void SetBestChain(const CBlockLocator& loc);

	int LoadWallet(bool& fFirstRunRet);

	bool SetAddressBookName(const CTxDestination& address, const std::string& strName);

	bool DelAddressBookName(const CTxDestination& address);

	void UpdatedTransaction(const uint256 &hashTx);

	void PrintWallet(const CBlock& block);

	void Inventory(const uint256 &hash)
	{
	{
	LOCK(cs_wallet);
	std::map<uint256, int>::iterator mi = mapRequestCount.find(hash);
	if (mi != mapRequestCount.end())
	(*mi).second++;
	}
	}

	int GetKeyPoolSize()
	{
	return setKeyPool.size();
	}

	bool GetTransaction(const uint256 &hashTx, CWalletTx& wtx);

	bool SetDefaultKey(const CPubKey &vchPubKey);

	// signify that a particular wallet feature is now used. this may change nWalletVersion and nWalletMaxVersion if those are lower
	bool SetMinVersion(enum WalletFeature, CWalletDB* pwalletdbIn = NULL, bool fExplicit = false);

	// change which version we're allowed to upgrade to (note that this does not immediately imply upgrading to that format)
	bool SetMaxVersion(int nVersion);

	// get the current wallet format (the oldest client version guaranteed to understand this wallet)
	int GetVersion() { return nWalletVersion; }

	/** Address book entry changed.
	* @note called with lock cs_wallet held.
	*/
	boost::signals2::signal<void (CWallet *wallet, const CTxDestination &address, const std::string &label, bool isMine, ChangeType status)> NotifyAddressBookChanged;

	/** Wallet transaction added, removed or updated.
	* @note called with lock cs_wallet held.
	*/
	boost::signals2::signal<void (CWallet *wallet, const uint256 &hashTx, ChangeType status)> NotifyTransactionChanged;
	};

	/** A key allocated from the key pool. */
	class CReserveKey
	{
	protected:
	CWallet* pwallet;
	int64 nIndex;
	CPubKey vchPubKey;
	public:
	CReserveKey(CWallet* pwalletIn)
	{
	nIndex = -1;
	pwallet = pwalletIn;
	}

	~CReserveKey()
	{
	if (!fShutdown)
	ReturnKey();
	}

	void ReturnKey();
	CPubKey GetReservedKey();
	void KeepKey();
	};


	typedef std::map<std::string, std::string> mapValue_t;


	static void ReadOrderPos(int64& nOrderPos, mapValue_t& mapValue)
	{
	if (!mapValue.count("n"))
	{
	nOrderPos = -1; // TODO: calculate elsewhere
	return;
	}
	nOrderPos = atoi64(mapValue["n"].c_str());
	}


	static void WriteOrderPos(const int64& nOrderPos, mapValue_t& mapValue)
	{
	if (nOrderPos == -1)
	return;
	mapValue["n"] = i64tostr(nOrderPos);
	}


	/** A transaction with a bunch of additional info that only the owner cares about.
	* It includes any unrecorded transactions needed to link it back to the block chain.
	*/
	class CWalletTx : public CMerkleTx
	{
	private:
	const CWallet* pwallet;

	public:
	std::vector<CMerkleTx> vtxPrev;
	mapValue_t mapValue;
	std::vector<std::pair<std::string, std::string> > vOrderForm;
	unsigned int fTimeReceivedIsTxTime;
	unsigned int nTimeReceived; // time received by this node
	unsigned int nTimeSmart;
	char fFromMe;
	std::string strFromAccount;
	std::vector<char> vfSpent; // which outputs are already spent
	int64 nOrderPos; // position in ordered transaction list

	// memory only
	mutable bool fDebitCached;
	mutable bool fCreditCached;
	mutable bool fAvailableCreditCached;
	mutable bool fChangeCached;
	mutable int64 nDebitCached;
	mutable int64 nCreditCached;
	mutable int64 nAvailableCreditCached;
	mutable int64 nChangeCached;

	CWalletTx()
	{
	Init(NULL);
	}

	CWalletTx(const CWallet* pwalletIn)
	{
	Init(pwalletIn);
	}

	CWalletTx(const CWallet* pwalletIn, const CMerkleTx& txIn) : CMerkleTx(txIn)
	{
	Init(pwalletIn);
	}

	CWalletTx(const CWallet* pwalletIn, const CTransaction& txIn) : CMerkleTx(txIn)
	{
	Init(pwalletIn);
	}

	void Init(const CWallet* pwalletIn)
	{
	pwallet = pwalletIn;
	vtxPrev.clear();
	mapValue.clear();
	vOrderForm.clear();
	fTimeReceivedIsTxTime = false;
	nTimeReceived = 0;
	nTimeSmart = 0;
	fFromMe = false;
	strFromAccount.clear();
	vfSpent.clear();
	fDebitCached = false;
	fCreditCached = false;
	fAvailableCreditCached = false;
	fChangeCached = false;
	nDebitCached = 0;
	nCreditCached = 0;
	nAvailableCreditCached = 0;
	nChangeCached = 0;
	nOrderPos = -1;
	}

	IMPLEMENT_SERIALIZE
	(
	CWalletTx* pthis = const_cast<CWalletTx*>(this);
	if (fRead)
	pthis->Init(NULL);
	char fSpent = false;

	if (!fRead)
	{
	pthis->mapValue["fromaccount"] = pthis->strFromAccount;

	std::string str;
	BOOST_FOREACH(char f, vfSpent)
	{
	str += (f ? '1' : '0');
	if (f)
	fSpent = true;
	}
	pthis->mapValue["spent"] = str;

	WriteOrderPos(pthis->nOrderPos, pthis->mapValue);

	if (nTimeSmart)
	pthis->mapValue["timesmart"] = strprintf("%u", nTimeSmart);
	}

	nSerSize += SerReadWrite(s, (CMerkleTx)this, nType, nVersion,ser_action);
	READWRITE(vtxPrev);
	READWRITE(mapValue);
	READWRITE(vOrderForm);
	READWRITE(fTimeReceivedIsTxTime);
	READWRITE(nTimeReceived);
	READWRITE(fFromMe);
	READWRITE(fSpent);

	if (fRead)
	{
	pthis->strFromAccount = pthis->mapValue["fromaccount"];

	if (mapValue.count("spent"))
	BOOST_FOREACH(char c, pthis->mapValue["spent"])
	pthis->vfSpent.push_back(c != '0');
	else
	pthis->vfSpent.assign(vout.size(), fSpent);

	ReadOrderPos(pthis->nOrderPos, pthis->mapValue);

	pthis->nTimeSmart = mapValue.count("timesmart") ? (unsigned int)atoi64(pthis->mapValue["timesmart"]) : 0;
	}

	pthis->mapValue.erase("fromaccount");
	pthis->mapValue.erase("version");
	pthis->mapValue.erase("spent");
	pthis->mapValue.erase("n");
	pthis->mapValue.erase("timesmart");
	)

	// marks certain txout's as spent
	// returns true if any update took place
	bool UpdateSpent(const std::vector<char>& vfNewSpent)
	{
	bool fReturn = false;
	for (unsigned int i = 0; i < vfNewSpent.size(); i++)
	{
	if (i == vfSpent.size())
	break;

	if (vfNewSpent[i] && !vfSpent[i])
	{
	vfSpent[i] = true;
	fReturn = true;
	fAvailableCreditCached = false;
	}
	}
	return fReturn;
	}

	// make sure balances are recalculated
	void MarkDirty()
	{
	fCreditCached = false;
	fAvailableCreditCached = false;
	fDebitCached = false;
	fChangeCached = false;
	}

	void BindWallet(CWallet *pwalletIn)
	{
	pwallet = pwalletIn;
	MarkDirty();
	}

	void MarkSpent(unsigned int nOut)
	{
	if (nOut >= vout.size())
	throw std::runtime_error("CWalletTx::MarkSpent() : nOut out of range");
	vfSpent.resize(vout.size());
	if (!vfSpent[nOut])
	{
	vfSpent[nOut] = true;
	fAvailableCreditCached = false;
	}
	}

	bool IsSpent(unsigned int nOut) const
	{
	if (nOut >= vout.size())
	throw std::runtime_error("CWalletTx::IsSpent() : nOut out of range");
	if (nOut >= vfSpent.size())
	return false;
	return (!!vfSpent[nOut]);
	}

	int64 GetDebit() const
	{
	if (vin.empty())
	return 0;
	if (fDebitCached)
	return nDebitCached;
	nDebitCached = pwallet->GetDebit(*this);
	fDebitCached = true;
	return nDebitCached;
	}

	int64 GetCredit(bool fUseCache=true) const
	{
	// Must wait until coinbase is safely deep enough in the chain before valuing it
	if (IsCoinBase() && GetBlocksToMaturity() > 0)
	return 0;

	// GetBalance can assume transactions in mapWallet won't change
	if (fUseCache && fCreditCached)
	return nCreditCached;
	nCreditCached = pwallet->GetCredit(*this);
	fCreditCached = true;
	return nCreditCached;
	}

	int64 GetAvailableCredit(bool fUseCache=true) const
	{
	// Must wait until coinbase is safely deep enough in the chain before valuing it
	if (IsCoinBase() && GetBlocksToMaturity() > 0)
	return 0;

	if (fUseCache && fAvailableCreditCached)
	return nAvailableCreditCached;

	int64 nCredit = 0;
	for (unsigned int i = 0; i < vout.size(); i++)
	{
	if (!IsSpent(i))
	{
	const CTxOut &txout = vout[i];
	nCredit += pwallet->GetCredit(txout);
	if (!MoneyRange(nCredit))
	throw std::runtime_error("CWalletTx::GetAvailableCredit() : value out of range");
	}
	}

	nAvailableCreditCached = nCredit;
	fAvailableCreditCached = true;
	return nCredit;
	}


	int64 GetChange() const
	{
	if (fChangeCached)
	return nChangeCached;
	nChangeCached = pwallet->GetChange(*this);
	fChangeCached = true;
	return nChangeCached;
	}

	void GetAmounts(std::list<std::pair<CTxDestination, int64> >& listReceived,
	std::list<std::pair<CTxDestination, int64> >& listSent, int64& nFee, std::string& strSentAccount) const;

	void GetAccountAmounts(const std::string& strAccount, int64& nReceived,
	int64& nSent, int64& nFee) const;

	bool IsFromMe() const
	{
	return (GetDebit() > 0);
	}

	bool IsConfirmed() const
	{
	// Quick answer in most cases
	if (!IsFinal())
	return false;
	if (GetDepthInMainChain() >= 1)
	return true;
	if (!IsFromMe()) // using wtx's cached debit
	return false;

	// If no confirmations but it's from us, we can still
	// consider it confirmed if all dependencies are confirmed
	std::map<uint256, const CMerkleTx*> mapPrev;
	std::vector<const CMerkleTx*> vWorkQueue;
	vWorkQueue.reserve(vtxPrev.size()+1);
	vWorkQueue.push_back(this);
	for (unsigned int i = 0; i < vWorkQueue.size(); i++)
	{
	const CMerkleTx* ptx = vWorkQueue[i];

	if (!ptx->IsFinal())
	return false;
	if (ptx->GetDepthInMainChain() >= 1)
	continue;
	if (!pwallet->IsFromMe(*ptx))
	return false;

	if (mapPrev.empty())
	{
	BOOST_FOREACH(const CMerkleTx& tx, vtxPrev)
	mapPrev[tx.GetHash()] = &tx;
	}

	BOOST_FOREACH(const CTxIn& txin, ptx->vin)
	{
	if (!mapPrev.count(txin.prevout.hash))
	return false;
	vWorkQueue.push_back(mapPrev[txin.prevout.hash]);
	}
	}
	return true;
	}

	bool WriteToDisk();

	int64 GetTxTime() const;
	int GetRequestCount() const;

	void AddSupportingTransactions(CTxDB& txdb);

	bool AcceptWalletTransaction(CTxDB& txdb, bool fCheckInputs=true);
	bool AcceptWalletTransaction();

	void RelayWalletTransaction(CTxDB& txdb);
	void RelayWalletTransaction();
	};




	class COutput
	{
	public:
	const CWalletTx *tx;
	int i;
	int nDepth;

	COutput(const CWalletTx *txIn, int iIn, int nDepthIn)
	{
	tx = txIn; i = iIn; nDepth = nDepthIn;
	}

	std::string ToString() const
	{
	return strprintf("COutput(%s, %d, %d) [%s]", tx->GetHash().ToString().substr(0,10).c_str(), i, nDepth, FormatMoney(tx->vout[i].nValue).c_str());
	}

	void print() const
	{
	printf("%s\n", ToString().c_str());
	}
	};




	/** Private key that includes an expiration date in case it never gets used. */
	class CWalletKey
	{
	public:
	CPrivKey vchPrivKey;
	int64 nTimeCreated;
	int64 nTimeExpires;
	std::string strComment;
	//// todo: add something to note what created it (user, getnewaddress, change)
	//// maybe should have a map<string, string> property map

	CWalletKey(int64 nExpires=0)
	{
	nTimeCreated = (nExpires ? GetTime() : 0);
	nTimeExpires = nExpires;
	}

	IMPLEMENT_SERIALIZE
	(
	if (!(nType & SER_GETHASH))
	READWRITE(nVersion);
	READWRITE(vchPrivKey);
	READWRITE(nTimeCreated);
	READWRITE(nTimeExpires);
	READWRITE(strComment);
	)
	};






	/** Account information.
	* Stored in wallet with key "acc"+string account name.
	*/
	class CAccount
	{
	public:
	CPubKey vchPubKey;

	CAccount()
	{
	SetNull();
	}

	void SetNull()
	{
	vchPubKey = CPubKey();
	}

	IMPLEMENT_SERIALIZE
	(
	if (!(nType & SER_GETHASH))
	READWRITE(nVersion);
	READWRITE(vchPubKey);
	)
	};



	/** Internal transfers.
	* Database key is acentry<account><counter>.
	*/
	class CAccountingEntry
	{
	public:
	std::string strAccount;
	int64 nCreditDebit;
	int64 nTime;
	std::string strOtherAccount;
	std::string strComment;
	mapValue_t mapValue;
	int64 nOrderPos; // position in ordered transaction list
	uint64 nEntryNo;

	CAccountingEntry()
	{
	SetNull();
	}

	void SetNull()
	{
	nCreditDebit = 0;
	nTime = 0;
	strAccount.clear();
	strOtherAccount.clear();
	strComment.clear();
	nOrderPos = -1;
	}

	IMPLEMENT_SERIALIZE
	(
	CAccountingEntry& me = const_cast<CAccountingEntry>(this);
	if (!(nType & SER_GETHASH))
	READWRITE(nVersion);
	// Note: strAccount is serialized as part of the key, not here.
	READWRITE(nCreditDebit);
	READWRITE(nTime);
	READWRITE(strOtherAccount);

	if (!fRead)
	{
	WriteOrderPos(nOrderPos, me.mapValue);

	if (!(mapValue.empty() && _ssExtra.empty()))
	{
	CDataStream ss(nType, nVersion);
	ss.insert(ss.begin(), '\0');
	ss << mapValue;
	ss.insert(ss.end(), _ssExtra.begin(), _ssExtra.end());
	me.strComment.append(ss.str());
	}
	}

	READWRITE(strComment);

	size_t nSepPos = strComment.find("\0", 0, 1);
	if (fRead)
	{
	me.mapValue.clear();
	if (std::string::npos != nSepPos)
	{
	CDataStream ss(std::vector<char>(strComment.begin() + nSepPos + 1, strComment.end()), nType, nVersion);
	ss >> me.mapValue;
	me._ssExtra = std::vector<char>(ss.begin(), ss.end());
	}
	ReadOrderPos(me.nOrderPos, me.mapValue);
	}
	if (std::string::npos != nSepPos)
	me.strComment.erase(nSepPos);

	me.mapValue.erase("n");
	)

	private:
	std::vector<char> _ssExtra;
	};

	bool GetWalletFile(CWallet* pwallet, std::string &strWalletFileOut);

	#endif

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